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  • [M1KTA] Cores for baluns

    From M1KTA via rec.radio.amateur.moderat@21:1/5 to All on Tue Jun 7 15:02:52 2022
    XPost: rec.radio.amateur.moderated, uk.radio.amateur, free.uk.amateur-radio

    M1KTA's QRP ham radio blog

    ///////////////////////////////////////////
    Cores for baluns

    Posted: 07 Jun 2022 01:33 AM PDT http://m1kta-qrp.blogspot.com/2022/06/cores-for-baluns.html

    I have this printed out as I refer to it often enough so I reproduced it
    here (I cannot recall the original source tbh but all the values are in
    several reference books anyway) I got loads of torroids from GQRP club
    sales and W8DIZ.The different material works at different frequencies.
    These are often used in common mode chokes and wide band
    baluns.MaterialCommon mode choke frequency range (single turn)Common mode
    choke frequency range (multiple turns)Impedance transformer1:1 Balun (Choke)#313,5 - 100 MHz1,5 - 50 MHz-1,5 - 30 MHz#4325 - 600 MHz2 - 60 MHz2
    - 50 MHz2 - 30 MHz#52150 - 1000 MHz4 - 150 MHz1 - 60 MHz1 - 60 MHz#61200 -
    2000 MHz5 - 200 MHz15 - 200 MHz10 - 100 MHz#77200 kHz - 10 MHz100 kHz - 10 MHz0,5 - 8 MHz1 - 8 MHz31 MaterialPropertySymbolValueUnitInitial Permeabilityµi1500
    Flux Density @ Field strengthBH39005GaussOerstedResidual Flux DensityBr3200GaussCoersive forceHc0.28OerstedLoss Factor @ FrequencyTan δ/ µi201.010^-6MHzTemperature Coefficient of Initial Permeability (20 -70°C) 1.6%/°CCurie TemperatureTc>130°CResistivityρ3000ohm-cm
    31 MaterialPropertySymbolValueUnitInitial Permeabilityµi1500
    Flux Density @ Field strengthBH39005GaussOerstedResidual Flux DensityBr3200GaussCoersive forceHc0.28OerstedLoss Factor @ FrequencyTan δ/ µi201.010^-6MHzTemperature Coefficient of Initial Permeability (20 -70°C) 1.6%/°CCurie TemperatureTc>130°CResistivityρ3000ohm-cm43 MaterialPropertySymbolValueUnitInitial Permeabilityµi800
    Flux Density @ Field strengthBH290010GaussOerstedResidual Flux DensityBr1300GaussCoersive forceHc0.45OerstedLoss Factor @ FrequencyTan δ/ µi2501.010^-6MHzTemperature Coefficient of Initial Permeability (20 -70°C) 1.25%/°CCurie TemperatureTc>130°CResistivityρ1×10^5ohm-cm
    52 MaterialPropertySymbolValueUnitInitial Permeabilityµi250
    Flux Density @ Field strengthBH420010GaussOerstedResidual Flux DensityBr3300GaussCoersive forceHc0.6OerstedLoss Factor @ FrequencyTan δ/ µi451.010^-6MHzTemperature Coefficient of Initial Permeability (20 -70°C) 0.75%/°CCurie TemperatureTc>250°CResistivityρ1 x 10^9ohm-cm
    61 MaterialPropertySymbolValueUnitInitial Permeabilityµi125
    Flux Density @ Field strengthBH250015GaussOerstedResidual Flux DensityBr1000GaussCoersive forceHc1.1OerstedLoss Factor @ FrequencyTan δ/ µi301.010^-6MHzTemperature Coefficient of Initial Permeability (20 -70°C) 0.1%/°CCurie TemperatureTc>300°CResistivityρ1 x 10^8ohm-cm
    77 MaterialPropertySymbolValueUnitInitial Permeabilityµi2000
    Flux Density @ Field strengthBH51005GaussOerstedResidual Flux DensityBr1800GaussCoersive forceHc0.25OerstedLoss Factor @ FrequencyTan δ/ µi150.110^-6MHzTemperature Coefficient of Initial Permeability (20 -70°C) 1.2%/°CCurie TemperatureTc>200°CResistivityρ100ohm-cm

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